/*
 * Copyright (c) 2004-2013, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.knopflerfish.bundle.desktopawt;

import org.osgi.framework.*;
import java.awt.*;
import java.awt.event.*;

import java.util.*;
import java.io.*;

import org.knopflerfish.service.console.*;

public class Console implements ServiceListener {
  final static String CONSOLE_CLASS =
    "org.knopflerfish.service.console.ConsoleService";

  ConsoleAWT panel;

  Console() {

    panel = new ConsoleAWT();
    panel.start();

    String filter = "(objectclass=" + CONSOLE_CLASS + ")";
    try {
      ServiceReference[] srl = Activator.bc.getServiceReferences((String) null,
                                                                 filter);
      for(int i = 0; srl != null && i < srl.length; i++) {
        serviceChanged(new ServiceEvent(ServiceEvent.REGISTERED, srl[i]));
      }

      Activator.bc.addServiceListener(this, filter);

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void serviceChanged(ServiceEvent ev) {
    switch(ev.getType()) {
    case ServiceEvent.REGISTERED:
      if(consoleSR == null) {
        openConsole(ev.getServiceReference());
      }
      break;
    case ServiceEvent.UNREGISTERING:
      if(consoleSR == ev.getServiceReference()) {
        closeConsole();
      }
      break;
    }
  }

  ServiceReference consoleSR = null;
  ConsoleService console = null;
  Session               consoleSession = null;

  void openConsole(ServiceReference sr) {
    consoleSR = sr;
    console   = (ConsoleService)Activator.bc.getService(consoleSR);

    try {
      consoleSession =
        console.runSession("ConsoleAWT",
                            panel.in,
                           new PrintWriter(panel.out));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  void closeConsole() {
    if(consoleSR != null) {
      Activator.bc.ungetService(consoleSR);
      consoleSR = null;
      console   = null;
    }
  }
}
